CN102011797B - Micro flexible combined rolling bearing - Google Patents

Abstract

A fretting flexible combined rolling bearing, comprising more than three rows of inner rings (2), outer rings (3) and rolling elements (5) between the inner rings (2) and outer rings (3), the three rows There is at least one row of inner rings (2) and/or outer rings (3) and rolling elements (5) in at least one row of inner rings (2) and outer rings (3) with raceway rings (1). The raceway surface (1A) of the raceway ring (1) is in contact with the rolling elements (5), and the non-raceway surface (1B) of the raceway ring (1) is in contact with the inner ring (2) or outer ring (3) The arc groove (2A or 3A) is contacted and matched; the edge of the arc groove (2A or 3A) of the inner ring (2) or the outer ring (3) is embedded with a retaining ring (4); the rolling body (5), the raceway ring (1) and the space between the arc groove (2A or 3A) is filled with grease. This kind of rolling bearing has strong adaptability to complex load conditions, high transmission stability and precision, low contact stress and long service life.

Description

Micro-motion flexible combined rolling bearing

technical field

The invention relates to mechanical transmission bearings.

Background technique

Bearings are the core components that support rotating shafts and loads. From micron-level bearings supporting MEMS transmission shafts to meter-level bearings supporting giant hydroelectric generator shafts, they are widely used in various military and civilian electromechanical equipment. The academic basis of the bearing is: in service, the bearing bears the rotating torque and bending moment from the shaft or the support, and forms a complex random dynamic axial force and radial force on the raceway of the inner or outer ring of the bearing; and through the roller The contact with the raceways of the inner and outer rings combines the effect of lubrication to reduce wear, reduce temperature rise and noise, and strive to transmit the random dynamic load of rotating parts smoothly and efficiently.

The development of bearing technology in the world has undergone a change from sliding to rolling: sliding bearings have a large contact area and large transmission capacity, but the friction area is large, the friction loss is large, the transmission efficiency is low, and wear and temperature are prone to occur in the case of poor lubrication. liter failure, short life. Rolling bearings have natural advantages in structure and working principle, small contact area, small friction loss, and high transmission efficiency; but due to large contact stress, contact peeling and temperature rise failure are prone to occur under poor lubrication conditions; from increasing the contact area From the perspective of improving bearing capacity, rolling bearings develop towards multi-row, cylindrical and needle roller bearings; from the perspective of realizing axial load bearing, rolling bearings develop towards deep groove ball bearings, tapered roller bearings and axial thrust bearings. With the improvement of load capacity and performance, rolling bearings have widely replaced sliding bearings.

The key factors affecting the bearing capacity, transmission performance and life of rolling bearings include: contact stress, sliding friction and lubrication. The contact stress is generally reduced by using cylindrical rollers and improving the contact shape between the rollers and the raceway and applying multiple rows of rollers to increase the number of contact points; sliding friction occurs on the contact surface and the contact line between the rollers and the raceway The linear speed of each point is inconsistent, which can be improved through the design and manufacture of the contact shape between the roller and the raceway; the key role of lubrication is to reduce the friction coefficient and avoid dry friction; maintain the rolling contact film to avoid direct contact damage; absorb the working chamber of the bearing noise.

However, the structure of existing rolling bearings has insurmountable weaknesses: the inner and outer rings are integrated with the raceways; the rollers are in direct rigid contact with the raceways of the inner and outer rings, and the raceways cannot be adaptively oscillated and/or Circumferential misalignment, high contact stress, poor running stability of the bearing, high noise, low adaptability to complex loads, and short life.

Therefore, under the requirements of high performance, high precision, long life and high speed, heavy load and complex dynamic load environment, the existing bearing structure still needs to be improved.

Contents of the invention

The object of the present invention is to provide a fretting flexible combined rolling bearing, which has strong adaptability to complex load conditions, high transmission stability and precision, low contact stress and long service life.

The technical solution adopted by the present invention to achieve the purpose of the invention is: a fretting flexible combined rolling bearing, including three or more rows of inner rings, outer rings and rolling elements between the inner rings and outer rings, and its structural characteristics are: Among the three or more rows of inner rings and outer rings, at least one row of inner rings and/or outer rings is provided with a raceway ring between the rolling elements, and the raceway surface of the raceway ring is in contact with the rolling elements. The non-raceway surface of the raceway ring is in contact with the arc groove on the inner ring or outer ring; the edge of the arc groove on the inner ring or outer ring is embedded with a retaining ring; between the rolling body, the raceway ring and the arc groove The interstitial spaces are filled with grease.

Compared with prior art, the beneficial effect of the present invention is:

In the existing multi-row bearings, raceway rings are added to at least one row of inner rings and/or outer rings to replace the raceways on the inner rings and/or outer rings of the row to contact and rub against the rolling elements; the other raceway rings One side (non-raceway surface) is an arc surface paired with arc grooves on the inner ring and/or outer ring of the bearing, and the two form a wobble and/or circumferential stagger fretting fit in a lubricated environment, and the degree of wobble fretting is determined by the gear circle control. Therefore, the random bending and torsional rotational loads of the rollers acting on the raceway surface can be flexibly transmitted to the inner ring and/or through the adaptive oscillation and/or circumferential staggering of the non-raceway surface of the raceway ring. Or the outer ring, forming an adaptive micro-motion flexible force transmission mechanism, which reduces the impact, noise and contact stress between the raceway surface and the rolling elements, improves the stability of the bearing operation, the operation accuracy and the adaptability to complex random loads, and prolongs the bearing life. bearing life. Especially suitable for bearings with high performance, high precision, high speed requirements, heavy load, and strong random load service environment.

At the same time, since the bearing is mainly damaged by the contact between the raceway ring and the rolling elements, the inner and outer ring bodies with raceway rings can be made of relatively cheap materials, which reduces the manufacturing cost; after the raceway rings are worn out, only the raceway rings need to be replaced. There is no need to replace the entire inner or outer ring, which reduces the cost of use and maintenance.

The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

Description of drawings

Fig. 1 is a schematic cross-sectional structure diagram of Embodiment 1 of the present invention.

Fig. 2 is a schematic cross-sectional structure diagram of Embodiment 2 of the present invention.

Fig. 3 is a schematic cross-sectional structure diagram of Embodiment 3 of the present invention.

Fig. 4 is a schematic cross-sectional structure diagram of Embodiment 4 of the present invention.

Specific implementation method:

Embodiment one

As shown in Figure 1, a specific embodiment of the present invention is: a fretting flexible combined rolling bearing, including three rows of inner rings 2, outer rings 3 and rolling elements 5 between the inner rings 2 and outer rings 3, the Among the three rows of inner rings 2 and outer rings 3, a raceway ring 1 is arranged between the inner ring 2 of the middle row and the rolling elements 5. The raceway surface 1A of the raceway ring 1 is in contact with the rolling elements 5, and the raceway The non-raceway surface 1B of the ring 1 is in contact with the arc groove 2A on the inner ring 2; the edge of the arc groove 2A of the inner ring 2 is embedded with the retaining ring 4; the rolling body 5, the raceway ring 1 and the arc groove 2A The interstitial spaces between are filled with grease.

Figure 1 also shows that the rolling elements 5 in the outer two rows of the bearing in this example are tapered rollers, while the rolling elements 5 in the middle row are spherical rollers.

Embodiment two

As shown in Figure 2, a specific embodiment of the present invention is: a fretting flexible combined rolling bearing, including three rows of inner rings 2, outer rings 3 and rolling elements 5 between the inner rings 2 and outer rings 3, the Among the three rows of inner rings 2 and outer rings 3, a raceway ring 1 is arranged between the outer ring 3 of the middle row and the rolling elements 5. The raceway surface 1A of the raceway ring 1 is in contact with the rolling elements 5, and the raceway The non-raceway surface 1B of the ring 1 is in contact with the arc groove 3A on the outer ring 3; the edge of the arc groove 3A of the outer ring 3 is embedded with the retaining ring 4; the rolling body 5, the raceway ring 1 and the arc groove 3A The interstitial spaces between are filled with grease.

Figure 1 also shows that the rolling elements 5 in the outer two rows of the bearing in this example are tapered rollers, while the rolling elements 5 in the middle row are spherical rollers.

Obviously, the difference between this example and the first example is that the raceway ring 1 is arranged between the outer ring 3 and the rolling elements 5 .

Embodiment Three

Fig. 3 shows that this embodiment is basically the same as Embodiment 1, except that the rolling elements 5 in the middle row are cylindrical rollers.

Embodiment Four

As shown in Fig. 4, this embodiment is basically the same as the second embodiment, except that the rolling elements 5 in the middle row are cylindrical rollers.

Embodiment five

A fretting flexible combined rolling bearing includes four rows of inner rings, outer rings and rolling elements between the inner rings and the outer rings. In the outer two columns: a raceway ring is set between the inner ring and the outer ring and the rolling elements, the raceway surface of the raceway ring is in contact with the rolling elements, and the non-raceway surface of the raceway ring is in contact with the inner ring or outer ring. The arc-shaped grooves on the ring are in contact with each other; the edge of the arc-shaped groove of the inner ring or outer ring is embedded with a retaining ring; the gap space between the rolling element, the raceway ring and the arc-shaped groove is filled with grease.

Claims (1)

1. A fretting flexible combined rolling bearing, comprising three or more rows of inner rings (2), outer rings (3) and rolling elements (5) between the inner rings (2) and outer rings (3), It is characterized in that: among the three or more rows of inner rings (2) and outer rings (3), at least one row of inner rings (2) and/or outer rings (3) and rolling elements (5) There is a raceway ring (1) between them, the raceway surface (1A) of the raceway ring (1) is in contact with the rolling body (5) and the non-raceway surface (1B) of the raceway ring (1) is in contact with the inner ring (2) or the arc-shaped groove (2A or 3A) on the outer ring (3) is in contact with each other; through the adaptive oscillation and/or circumferential staggering of the non-raceway surface (1B) of the raceway ring (1), Therefore, the random bending and torsional loads of the rollers acting on the raceway surface (1A) are flexibly transmitted to the inner ring (2) and/or outer ring (3), forming an adaptive fretting flexible force transmission mechanism; the inner ring (2) or the edge of the arc groove (2A or 3A) of the outer ring (3) is embedded with a retaining ring (4); Fill the interstitial space with grease.